hi all Wanted Coronado BF10 I have been after one of these for a while as it will enhance my Ha observing through my PST mod and I seem to be doing more solar observing than anything currently. I will need to sell a couple of bits to buy this if one comes up quickly (doubtful though based on previou...

Cheers Mark Your previous comment gave me the confidence to try the filter on the end of my stage 2 pst modded focuser/BF/Etalon and to insert the lot into the 60mm tube to test for the correct focus /etalon position and I am pleased to report that it seems to work perfectly and allows full disk at ...

Cheers Mark
is my logic of how these filters work sound? I.e. The reference to e.g. 45nm means all wavelengths other than 22.5nm either side of optimal are rejected?

Hi all I have a larger 100mm stage 2 PST mod and use a 90mm Baader DERF in the light cone for this but want something smaller to take on holidays etc. I have found a suitable donor scope, a 60mm f10 cheapie refractor. Rather than try to find a DERF I have been offered a Baader 35nm Ha 2" filter...